Chop the onion and ginger and place in a tall bowl with the tea bags and rock candy, pour the boiling water on top. After 5-6 minutes, take out the tea bags. After 1/2 hour, pour the tea through a sieve into a pot.
I give my children about 100 ml of this tea a day as soon as they show the first signs of a cold. Can also be drunk cold. It is particularly good at combating coughs.